Istanbul and San Francisco Time Zone Comparison
The distance between Istanbul and San Francisco is felt not just in kilometers, but in time zones too. Istanbul and San Francisco sit on different continents, in noticeably different time zones, and at least one of them observes daylight saving time.
Because Istanbul and/or San Francisco observe daylight saving time for part of the year, the gap between them isn't fixed — it ranges between 10 and 11 hours depending on the season.
With a gap this large, business hours barely overlap between Istanbul and San Francisco — an early morning or a late evening on one side is usually needed to connect with the other.